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call it again with a sub-key-sequence, and if its return value
is non-nil (sub-key is bound), return nil.

after insert which runs signal_after_change.

(describe_map, describe_vector): Likewise.  When it's 1,
don't omit shadowed bindings, instead mark them as shadowed.

if Voverriding_terminal_local_map is non-nil.

map-keymap-internal to implement that.

(syms_of_keymap) <key-translation-map>: Doc fixes.

(Fkey_description, Fglobal_key_binding): Fix typo in docstring.

Combine prefix with KEYS to make up the full key sequence to describe.
Correlate meta_prefix_char and following (simple) key to describe
as meta modifier.  All callers changed.
(describe_map): Rename arg `keys' to `prefix'.  Remove local
`elt_prefix' var.  Use Fkey_description with prefix instead of
elt_prefix combined with Fsingle_key_description.
(describe_vector): Declare static.  Replace arg `elt_prefix' with
`prefix'.  Add KEYMAP_P arg.  Add local var `elt_prefix'; use it
if !KEYMAP_P. Use Fkey_description with prefix instead of
Fsingle_key_description.

(syms_of_keymap): Add mouse-[45], header-line, and mode-line to it.

(Faccessible_keymaps): Pass new arg to map_char_table.

(map_keymap_call, Fmap_keymap): New functions.
(syms_of_keymap): Defsubr map-keymap.

multiple occurrences of the same keymap under different prefixes.
(Faccessible_keymaps): Remove code redundant since 1994-08-03T07:39:00Z!rms@gnu.org.

(syms_of_keymap): Initialize it.
(where_is_internal): Check more carefully what is a menu event.

(syms_of_keymap): staticpro them.
(Fapropos_internal): Initialize them and clear them out.
Don't GCPRO them.